During red carpet season, we ogle celebrities at the award ceremonies, examining their skin and hair, along with “who they’re wearing.”

It’s hard not to notice women who have clear, radiant, vibrant-looking skin, which is a sign of good health. While celebrities spend a lot of time improving the appearance of their skin from the outside, the real key to young-looking skin is proper nutrition and healthy habits.

In addition to eating healthfully and exercising, there’s a little-discussed supplement that can help prevent the wrinkling and dryness that contribute to old-looking skin. It’s called hyaluronic acid (HA). HA is a glycosaminoglycan that acts as the intracellular cement or glue of connective tissue. Connective tissue, as the term suggests, serves the function of supporting and binding other tissues. The loose connective tissue holds the skin and internal organs in place, while the fibrous connective tissue includes tendons, ligaments, and cartilage. In essence, hyaluronic acid not only helps to provide the structural framework of connective tissue, it is the actual “glue” that holds our body together.

Maintaining HA in body tissues is an important anti-aging strategy. One of the reasons our skin develops lines and wrinkles is due to the loss of HA. By the time most people reach the age of 70, the HA content in their body has dropped by 80% from when they were 40. After the age of 45 or so, HA levels in the skin begin to plummet.

There is a great deal of evidence that applying HA topically helps prevent wrinkles. But now researchers have discovered that taking hyaluronic acid orally is also beneficial for restoring moisture and youthful suppleness to the skin. Recent clinical studies using oral HA in patients with dry and rough skin have shown that patients given a supplement consisting of purified, bioavailable hyaluronic acid had a significant increase (46%) over baseline values in the moisture content of their skin.

Hyaluronic acid is a substance found in our bodies that’s essential for health, but now we know it’s also a key to beautiful-looking skin.

Dr. Michael T. Murray is one of the world’s leading authorities on natural medicine and the author of more than 30 bestselling books, including The Encyclopedia of Natural Medicine. He is a graduate and former faculty member, and serves on the Board of Regents, of Bastyr University in Seattle, Washington.